Investigation on the micro bending of metallic crystal by the non-local crystal plasticity finite element method
A higher order dislocation density based crystal plasticity finite element method is adopted to investigate the deformation behaviours of metallic crystal during the process of micro bending,both statistically stored dislocations (SSDs) and geometrically necessary dislocations (GNDs) in each slip system are taken as the internal state variables.The combined effects of the microstructure heterogeneous,such as the orientation distribution of grains and dislocation density distribution,are described by means of the non-local model.Two models with different number of grains across the thickness are simulated,with the aim to investigate the evolutions and distributions of SSDs and GNDs,as well as the aggregation of GNDs in the neighbourhood of grain boundary.The calculated dislocation density distribution is compared with the micro hardness distribution obtained from the micro bending experiments.According to the results from the simulations and experiments,the strengthening effect of SSDs and GNDs during the micro bending are discussed,it is confirmed that the present physically based model gives an insight into the deformation mechanism and dislocation density evolution in the micro bending process.
micro bending crystal plasticity statistically stored dislocations geometrically necessary dislocations
Haiming ZHANG Xianghuai Dong Hezong LI Qian WANG
National Die & Mold CAD Engineering Research Center, Shanghai Jiao Tong University, 1954 Hua Shan Ro Deportment of Mechanical and Electrical Engineering, Hebei University of Engineering, 199 Guangming
国际会议
第五届亚洲微纳成形技术研讨会(AMMFT2012)暨第三届微纳成形学术委员会会议
哈尔滨
英文
10-14
2012-08-01（万方平台首次上网日期，不代表论文的发表时间）